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Today is Bicycle Day – not, as you might think, a celebration of all things two-wheeled and pedal-powered, but rather the day that psychonauts celebrate the anniversary of the world’s first ever acid trip.

On 19 April 1943, Swiss chemist Albert Hoffman deliberately ingested a large dose of LSD. He later wrote about his experiences: ‘There was to my knowledge no other known substance that evoked such profound psychic effects in such extremely low doses, that caused such dramatic changes in human consciousness and our experience of the inner and outer world.’

To mark Bicycle Day, here’s a selection quotes about LSD from 12 high-profile public figures, most of who have experimented with acid, and all of who have strong opinions on the drug; some positive, some less so.